?What You Get?1x cost-effective QSFP28 to SFP28 QSA adapter. 10Gtek is a manufacturer of DAC/Transceiver/AOC/NIC/Media Converter, customized service also is available. ?QSA vs QSFP28 Breakout Cable?Not all the 100G cards and switches can be split into 4 x 25 Gb mode, for example, the Mellanox QSFP28 cards do not support the QSFP28 to SFP28 breakout, but they support QSA. And QSA can be used for longer transmission distances than QSFP28 Breakout Cable. ?Convenient and Flexible Use?With QSA adapter, you can flexibly use any SFP28 module or cable to connect to a lower-speed port on the other end of the network with low insertion loss and crosstalk. Plug and play, without any setup. ?Smooth Speed Migration?10Gtek QSA adapter Module offers 25 Gigabit Ethernet connectivity for QSFP28-only platforms. It allows smooth and cost-effective migration to 100 Gigabit Ethernet by providing an option to use lower-speed. ?Wide Compatibility?This adapter supports all Mellanox SFP28 optics and cable reaches, such as MMA2P00-AS, MMA2L20-AR, SFP28 Passive Copper Cable and SFP28 Active Optical Cable. I2C read port information comes from SFP28 port module, not QSA Module.